Reality: Not True
Bass is a product of different factors, including the mass of the moving elements (cone, voice coil, and suspension) the power area of the speaker magnet, and the volume of air in the cabinet. As with any recipe, altering any one of these ingredients will yield speakers with a different flavor. Just looking at the woofer won’t tell you the quality of bass a speaker produces. That’s something your ears can evaluate better than any tape measure.
